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t <br /> i <br /> ASSESSMENT OF GROUNDWATER CONTAMINATION <br />' ARTS & ARTISTS <br /> 204 East Lodi, California <br /> BACKGROUND <br /> The site is located in a flat commercial area in central Lodi <br /> (Figure 1 - Location Map, 7. 5 Minute Lodi North Quadrangle, USGS j <br /> Topographic Map Series, 1976) . <br /> . _ ._._ <br /> wt,a h 1ep,1 d <br />' p P? Jan ,ar <br /> gamy, 19 '7 . Soil <br /> les collected at that time contained u to 1 400 ppm gasoline. <br /> Toluene and xylene were also present. San Joaquin County Public <br />.' Health Services - Environmental Health Division (SJPHS/EHD) <br /> determined that an unauthorized release of hydrocarbons had <br /> occurred, and requested assessment of the lateral and vertical <br /> extent of soil contamination. <br /> Three soil borings were installed in August of 1987 and converted <br /> to groundwater monitoring wells (see Figure 2 - Site Plan) . <br /> Groundwater was encountered at approximately 50 ft, and the wells <br /> y were screened to at least 60 ft. Groundwater gradient appeared to <br /> be to the north-northeaa9t. Total petroleum hydrocarbons (TPH as <br /> gasoline) were detected in soil samples from MW-1 at levels as high <br />' as 6, 900 mg/kg (ppm) . Purgeable aromatics (BTE&X) were detected in <br /> samples from MW-1 at levels as high as 540 rig/kg. Poo hydrocarbon <br /> contamination was detected in soil samples from MW-2 or MW-3 . <br /> i'� One water sample was collected from each well by Weiss Associates. <br /> BTE&X were detected in all three wells at levels as high as 2 , 800 <br /> µg/L (MW-3) . TPH as gasoline was detected in MW-1 and MW-3 at <br /> levels of 13 mg/L and 14 mg/L, respectively. <br /> 1 The first quarterly monitoring of these wells was conducted in <br /> November 1991 by Earth Systems Environmental, Inc. According to a <br /> letter report from Earth Systems Environmental to Ms. Mary Meays of <br /> San Joaquin EHD, dated 25 November 1991, MW-2 and MW-3 were dry at <br /> that time. MW-1, which had been screened to 65 ft, contained <br />' floating product at a depth of approximately 60 ft and was not <br /> sampled. <br /> 1 On 3 January 1992 , SJPHS/EHD requested the owner of the property, <br /> Mrs. Mary Lehr, to install two new monitoring wells to replace MW-2 <br /> and MW-3 . A GeoAudit workplan for the additional work was approved <br /> hu MCMaal7C nn 7F M-Yr Ih 1 0o'1 ...i �L... ..�. �r_�.__� -r_--- <br /> of 1992 . <br />